How to register a constituted group or association with HMRC and your responsibilities for filing taxes outlines statutory registration requirements, tax obligations, and legal responsibilities for unregistered non-profit organisations in the UK. Unincorporated associations, including community clubs, sports societies, and voluntary groups, are treated as corporate entities for tax purposes and must register for Corporation Tax if they carry out commercial activities or generate taxable profits. Associations must notify His Majesty's Revenue and Customs within 3 months of starting trading activities and submit an annual Corporation Tax Return (CT600) along with compiled accounts. Small non-profit groups with no taxable profits or commercial revenue can apply to HMRC for dormant status, exempting them from annual return submissions for up to 5 years. Utilising Open Banking tax applications like Pie enables non-profit treasurers to track group income and expenditure in real time, distinguish trading profits from non-taxable subscriptions, and maintain transparent records for direct HMRC compliance.